Any idea why immigration lawyers advise against this?
A related issue is for NWOHRs born abroad who want to establish HHR under the new 2024 law (allowing immediate HHR establishment without a 1-year TARC wait), but who do not have a permanent address of their own in Taiwan. For now, the only way I see to solve this is for the applicant to sign some kind of a lease contract with a traditional apartment, that can then be used as evidence of an address, that can then be used to establish HHR. But that’s inconvenient because you’re dealing with an unknown landlord (who may be evading taxes and wanting to avoid any kind of official acknowledgement that anyone is renting a room), and the lease may have some minimum term like a 1-year rental.
I think there is a business opportunity here if someone in Taiwan (a Forumosan perhaps?) could open up a short-term, month-to-month, dormitory-style residence where people would be allowed to rent and live in a room for some months as needed, to register that address with the HHR office or other agencies as needed, and as an option, whenever not living in Taiwan, to pay somewhat less just to keep an “address” to receive mail and possibly store belongings. And if the property would be willing to run a mail scanning and/or forwarding service to overseas, for people like the OP who temporarily moved away but plan to return to Taiwan, that would be even better.
Not sure about the legal implications for the landlord in this case, but as a tenant, I would certainly find such a service convenient.